GB543881A - Improvements in parallel rules - Google Patents

Improvements in parallel rules

Info

Publication number
GB543881A
GB543881A GB631141A GB631141A GB543881A GB 543881 A GB543881 A GB 543881A GB 631141 A GB631141 A GB 631141A GB 631141 A GB631141 A GB 631141A GB 543881 A GB543881 A GB 543881A
Authority
GB
United Kingdom
Prior art keywords
edge
ruler
parallel
degree markings
marked
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB631141A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB631141A priority Critical patent/GB543881A/en
Publication of GB543881A publication Critical patent/GB543881A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B3/00—Measuring instruments characterised by the use of mechanical techniques
    • G01B3/02—Rulers with scales or marks for direct reading

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Drawing Aids And Blackboards (AREA)

Abstract

543,881. Protractors; parallel rulers. MACLEAN, J. D. May 16, 1941, No. 6311. [Class 97 (iii)] A parallel ruler and protractor, the edge of which is marked from 0 degrees to 360 degrees, is provided adjacent each end with a transverse slot C with an edge permitting of the application of complementary degree markings and figures. Fig. 1 shows a parallel ruler of the roller type having rollers on the under surface and the transverse slots C having the edge D marked with the complementary degree markings and figures. Fig. 3 shows the split type with links I. The degree markings are on the under surface of the ruler or on a plate the ruler or its edge being transparent to obviate parallax.
GB631141A 1941-05-16 1941-05-16 Improvements in parallel rules Expired GB543881A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB631141A GB543881A (en) 1941-05-16 1941-05-16 Improvements in parallel rules

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB631141A GB543881A (en) 1941-05-16 1941-05-16 Improvements in parallel rules

Publications (1)

Publication Number Publication Date
GB543881A true GB543881A (en) 1942-03-17

Family

ID=9812187

Family Applications (1)

Application Number Title Priority Date Filing Date
GB631141A Expired GB543881A (en) 1941-05-16 1941-05-16 Improvements in parallel rules

Country Status (1)

Country Link
GB (1) GB543881A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2192286A (en) * 1986-06-27 1988-01-06 Smiths Industries Plc Parallel protractor rule

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2192286A (en) * 1986-06-27 1988-01-06 Smiths Industries Plc Parallel protractor rule

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